[C++知识库]C++ 正态分布随机数 平均分布随机数 default_random_engine normal_distribution

#include <iostream>
#include <vector>
#include <string>
#include <random>
#include <algorithm>
#include <cmath>


using namespace std;


int main()
{
        const auto random_seed = 199712;

        std::default_random_engine engine(static_cast<unsigned int>(random_seed)); //定义随机数生成引擎
        std::uniform_real_distribution<double> even(-3.0, 3.0);//取值范围
        std::vector<double>valueVector(20);

        for(std::size_t i=0; i < 20; ++i) {
                valueVector[i] = even(engine);//按照上述平均分布生成随机数
        }

        for (std::size_t j=0; j < valueVector.size(); ++j)
                std::cout << valueVector[j]<<endl;

        return 0;
}

#include <iostream>
#include <vector>
#include <string>
#include <random>
#include <algorithm>
#include <cmath>


using namespace std;


int main()
{       auto seed = 19917;
        std::default_random_engine e(static_cast<unsigned int>(seed)); //定义随机数生成引擎
        std::normal_distribution<double> n(4.0, 0.517);//4.0 是均值, 0.517是方差
        std::vector<double>valueVector(20);

        for(std::size_t i=0; i < 20; ++i) {
                valueVector[i] = n(e);//按照上述正态分布生成随机数
        }

        for (std::size_t j=0; j < valueVector.size(); ++j)
                std::cout << valueVector[j]<<endl;

        return 0;
}